/// <exception cref="System.IO.IOException"/>
/// <exception cref="Javax.Servlet.ServletException"/>
public override void DoFilter(HttpServletRequest request, HttpServletResponse response
, FilterChain chain)
{
response.SetCharacterEncoding("UTF-8");
string uri = HtmlQuoting.QuoteHtmlChars(request.GetRequestURI());
if (uri == null)
{
uri = "/";
}
RMWebApp rmWebApp = injector.GetInstance <RMWebApp>();
rmWebApp.CheckIfStandbyRM();
if (rmWebApp.IsStandby() && ShouldRedirect(rmWebApp, uri))
{
string redirectPath = rmWebApp.GetRedirectPath();
if (redirectPath != null && !redirectPath.IsEmpty())
{
redirectPath += uri;
string redirectMsg = "This is standby RM. The redirect url is: " + redirectPath;
PrintWriter @out = response.GetWriter();
@out.WriteLine(redirectMsg);
response.SetHeader("Location", redirectPath);
response.SetStatus(HttpServletResponse.ScTemporaryRedirect);
return;
}
else
{
bool doRetry = true;
string retryIntervalStr = request.GetParameter(YarnWebParams.NextRefreshInterval);
int retryInterval = 0;
if (retryIntervalStr != null)
{
try
{
retryInterval = System.Convert.ToInt32(retryIntervalStr.Trim());
}
catch (FormatException)
{
doRetry = false;
}
}
int next = CalculateExponentialTime(retryInterval);
string redirectUrl = AppendOrReplaceParamter(path + uri, YarnWebParams.NextRefreshInterval
+ "=" + (retryInterval + 1));
if (redirectUrl == null || next > MaxSleepTime)
{
doRetry = false;
}
string redirectMsg = doRetry ? "Can not find any active RM. Will retry in next "
+ next + " seconds." : "There is no active RM right now.";
redirectMsg += "\nHA Zookeeper Connection State: " + rmWebApp.GetHAZookeeperConnectionState
();
PrintWriter @out = response.GetWriter();
@out.WriteLine(redirectMsg);
if (doRetry)
{
response.SetHeader("Refresh", next + ";url=" + redirectUrl);
response.SetStatus(HttpServletResponse.ScTemporaryRedirect);
}
}
return;
}
base.DoFilter(request, response, chain);
}
private bool ShouldRedirect(RMWebApp rmWebApp, string uri)
{
return(!uri.Equals("/" + rmWebApp.WsName() + "/v1/cluster/info") && !uri.Equals("/"
+ rmWebApp.Name() + "/cluster") && !uri.StartsWith(ProxyUriUtils.ProxyBase) &&
!NonRedirectedUris.Contains(uri));
}